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3 years ago

Help from the pic plz I can't do it

Mathematics

2 answers:

Over [174]3 years ago

6 0

2.jerry buys 2lb of cheese and a box of cereal
3.jerry buys i lb of cheese and a box of cereal, which has a discount of 1$
4.jerry has 20$, he will buy two lb of cheese and will pay 1$ extra for each lb as iva. How many will he have left

Vsevolod [243]3 years ago

5 0

2. Simplify 5x2 to 10
10+4= 14
The answer is 14.

3. 5+(4-1)
Simply 4-1 to 3
5+3
The answer is 8.

4. 20-(6x2)
Simply 6x2 to 12
20-12
The answer is 8.

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Step-by-step explanation:

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laiz [17]

Answer:

B) 0.02

Step-by-step explanation:

Use the Binomial Theorem

$\displaystyle P(X=x)=\binom{n}{x}p^xq^{n-x}\\\\P(X=4)=\binom{30}{4}(0.30)^4(1-0.30)^{30-4}\\\\P(X=4)=\frac{30!}{4!(30-4)!}(0.30)^4(0.70)^{26}\\ \\P(X=4)=\frac{30!}{4!(26)!}(0.30)^4(0.70)^{26}\\ \\P(X=4)=\frac{30*29*28*27}{4*3*2*1}(0.30)^4(0.70)^{26}\\ \\P(X=4)=27405(0.30)^4(0.70)^{26}\\\\P(X=4)\approx0.0208$

We have the probability of success, $p=0.30$ , and the probability of failure, $q=1-0.30=0.70$ . The binomial coefficient, $\binom{n}{k}$ , represents the amount of possible combinations that $k$ items can be chosen out of $n$ items, with its respective formula $\frac{n!}{k!(n-k)!}$ .

Hence, the best choice for the probability that 4 students chosen at random from the class of 30 that want the next test to be on Monday will be option B, 0.02

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2 years ago